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<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    // 创建三个Promise
    const p1 = new Promise((resolve, reject) => {
      setTimeout(() => {
        // resolve('p1')
        reject("p1 reject error")
      }, 3000)
    })
    const p2 = new Promise((resolve, reject) => {
      setTimeout(() => {
        resolve('p2')
      }, 2000)
    })
    const p3 = new Promise((resolve, reject) => {
      setTimeout(() => {
        resolve('p3')
      }, 5000)
    })

    // all:全部
    Promise.all([p1,p2,p3]).then(res=>{
      console.log('all promise res:',res)
    }).catch(err=>{
      console.log('all promise err:',err)
    })
  </script>
</body>

</html>